I think he fears the new Snart. He's has Leonard's face, but he's the exact opposite. He cracked me up in the crossover and as usual, he has a moment with her about women. It reminds me of the Rogue days, especially since we saw a Leonard around Sara.

Mick has made a lot of progress and Snart would be proud of him. I hated how Sara joined everyone when they ganged up on him last season. It made no sense and the two of them are on the same wavelength a lot of the time.

"Now, in each and every one of you, there is a light, a spirit that cannot be snuffed out. That won't give up.
I need you to hope. Hope that you will remember that you can all be heroes. Hope that when faced with
an enemy determined to destroy your spirit, you will fight back and thrive." - Kara Danvers {Supergirl}

I'm choosing to pretend that Doom Snart never existed. He was the world's crappiest friend and even on The Flash,he was never that stupid, short-sighted and awful. What's the point of robbing a bank if they just let you walk in and steal it? If it's not illegal, it's not really stealing. They weren't even criminals anymore. They were just rich and did whatever they wanted.